"ICS, we hardly knew ye. Builds for CyanogenMod 9 stable will be rolling out to our servers tonight. As noted before, this will be the end of the line for the ICS branch of our code; only critical bug fixes will be merged moving forward. [...] Tonight's release is for the majority of our ICS supported devices, the stragglers will catch up, and we will leave the door open for merging in additional devices from maintainers, external and internal. The team itself, will focus solely on Jelly Bean and maintenance of the CM 7 codebase." Already running the CM10/Jelly Bean previews on my SII, and while clearly not as polished yet as CM9, it works just fine. Great work.

If you go to the CyangenMod wiki there should be a page for you phone that has details on how to both root and then install CyanogenMod onto it

Already installed it, thanks.

Installing it was as simple as:

1- flashing the phone with recovery-clockwork-5.5.0.4-i9100g.tar (can be done with Heimdall or Odin)
2- copy CM9 and google apps into the phone mass storage.
3- Reboot the phone into the Recovery mode (vol up + home key + power button), wipe everything (cache, etc), execute the CM9 zip file, install it and also install the gapps.